//判断身份证是否合格

import {
    Message,
} from 'element-ui'

//地区
let area = {
    11: "北京", 12: "天津", 13: "河北", 14: "山西", 15: "内蒙古",

    21: "辽宁", 22: "吉林", 23: "黑龙江", 31: "上海", 32: "江苏",

    33: "浙江", 34: "安徽", 35: "福建", 36: "江西", 37: "山东", 41: "河南",

    42: "湖北", 43: "湖南", 44: "广东", 45: "广西", 46: "海南", 50: "重庆",

    51: "四川", 52: "贵州", 53: "云南", 54: "西藏", 61: "陕西", 62: "甘肃",

    63: "青海", 64: "宁夏", 65: "新疆", 71: "台湾", 81: "香港", 82: "澳门", 91: "国外"
};

//检查号码是否符合规范，包括长度，类型
let isCardNo = function (card) {

    //身份证号码为15位或者18位，15位时全为数字，18位前17位为数字，最后一位是校验位，可能为数字或字符X

    let reg = /(^\d{15}$)|(^\d{17}(\d|X)$)/;

    if (reg.test(card) === false) {
        return false;
    }

    return true;

};

//取身份证前两位,校验省份
let checkProvince = function (card) {

    let province = card.substr(0, 2);

    if (area[province] === undefined) {

        return false;

    }

    return true;

};

//检查生日是否正确
let checkBirthday = function (card) {

    let len = card.length;

    //身份证15位时，次序为省（3位）市（3位）年（2位）月（2位）日（2位）校验位（3位），皆为数字

    if (len === 15) {

        let re_fifteen = /^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/;

        let arr_data = card.match(re_fifteen);

        let year = arr_data[2];

        let month = arr_data[3];

        let day = arr_data[4];

        let birthday = new Date('19' + year + '/' + month + '/' + day);

        return verifyBirthday('19' + year, month, day, birthday);

    }

    //身份证18位时，次序为省（3位）市（3位）年（4位）月（2位）日（2位）校验位（4位），校验位末尾可能为X

    if (len === 18) {
        let re_eighteen = /^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/;

        let arr_data = card.match(re_eighteen);

        let year = arr_data[2];

        let month = arr_data[3];

        let day = arr_data[4];

        let birthday = new Date(year + '/' + month + '/' + day);

        return verifyBirthday(year, month, day, birthday);

    }

    return false;

};

//校验日期
let verifyBirthday = function (year, month, day, birthday) {

    let now = new Date();

    let now_year = now.getFullYear();

    //年月日是否合理

    if (String(birthday.getFullYear()) === String(year) &&
        String((birthday.getMonth() + 1)) === String(month) &&
        String(birthday.getDate()) === String(day)) {

        //判断年份的范围（3岁到100岁之间)

        let time = now_year - year;

        if (time >= 3 && time <= 100) {

            return true;

        }

        return false;

    }

    return false;

};

//校验位的检测
let checkParity = function (card) {

    //15位转18位

    card = changeFivteenToEighteen(card);

    let len = card.length;

    if (len == '18') {

        let arrInt = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];

        let arrCh = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'];

        let cardTemp = 0, i, valnum;

        for (i = 0; i < 17; i++) {

            cardTemp += card.substr(i, 1) * arrInt[i];

        }

        valnum = arrCh[cardTemp % 11];

        if (valnum === card.substr(17, 1)) {

            return true;

        }

        return false;

    }

    return false;

};

//15位转18位身份证号
let changeFivteenToEighteen = function (card) {

    if (card.length === '15') {

        let arrInt = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];

        let arrCh = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'];

        let cardTemp = 0, i;

        card = card.substr(0, 6) + '19' + card.substr(6, card.length - 6);

        for (i = 0; i < 17; i++) {

            cardTemp += card.substr(i, 1) * arrInt[i];

        }

        card += arrCh[cardTemp % 11];

        return card;

    }

    return card;
}

// 统一进行校验
let judgeIdCard = function (card) {

    //校验长度，类型

    if (isCardNo(card) === false) {
        Message.error('您输入的身份证号码不正确，请重新输入');
        return false;

    }

    //检查省份

    if (checkProvince(card) === false) {
        Message.error('您输入的身份证号码不正确,请重新输入');
        return false;

    }

    //校验生日

    if (checkBirthday(card) === false) {

        Message.error('您输入的身份证号码生日不正确,请重新输入');

        return false;

    }

    //检验位的检测

    if (checkParity(card) === false) {

        Message.error('您的身份证校验位不正确,请重新输入');

        return false;

    }

    return true;
}

//默认暴露
export default judgeIdCard
